Talking-machine mechanism.



WITNESSES:

T. KRAEMBR.

TALKING MACHINE MECHANISM.

APPLICATION FILED JUNE a, 1908.

91 3,828. Patented Mar. 2, 1909.

INVENTOR TTORNEY UNITED STATES PATENT OFFICE.

THOMAS KRAEMER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HAWTHORNE MSHE- BLE MANUFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

TALKING-MACHINE MECHANISM.

Specification of Letters Patent.

Patented March 2, 1909.

To all whom it may concem:

Be it known that I, THOMAS KRAEMER, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a certain new and useful Improvement in Talking-Machine Mechanism, of which the following is a specification.

This invention relates to talking machines and is directed to the provision of improved means for controlling the rotation of the record, whereby such rotation may be started and stopped and its speed regulated as desired.

In the operation of talking machines, it is important that the record be' rotated at just the proper s eed, since when rotated at any other speed t e tone of the reproduction is not so good, and also since rotation at greater than the proper speed causes excessive wear upon the record. I have, therefore, provided means by which the speed 'of rotationof the record may be predetermined, and with this an adjustable stop device is combined, which may be moved t'o any desired position with reference to a scale and which arrests the movement of the part which is operated to regulate the speed of rotation of the record.

In accordance with the invention, a starting and speed-regulatin' lever is provided upon the motor-box of t e machine and arranged to move relatively to a scale, by reference to which the lever may be moved to a osition which has been found to give the esired speed. An adjustable stop device is arranged in the path of this lever, so that when the speed desired for a reproduction' has been found, the stop device may be so positioned that it will arrest the lever in this position andthus permit of movinglthe lever rapidly to the desired position wit out referring to the scale.

I have illustrated the preferred embodiment of my invention in the accompanying drawing, in which Figure 1 is a view in elevation of a talking: machinebroken away in part; Fig. 2 is a top view of a portion of the machine, having' the motor-box broken away in part to show the governing mechanism; Fig. 3 is a side view of a portion of the machine with the casin similarly broken away; and Fig. 4 is a detail view hereinafter referred to.

Referring to these drawings,-1 indicates through the upper end thereof, and a I the motor-box of the machine, within which is a spring-motor driving a vertical shaft 2 which carries the turn-table of the machine. The disk record 4 is adapted to rest upon the turn-table 3 and to rotate therewith. Extending outwardly and upwardly from the box 1, is a coupling member 5 having an opening 10m 6 is supported upon the upper end of the member 5 withthe opening therethrough in communication with the opening through the member. A. tubular tone-arm 7 is piv otally mounted uponthe member 5 so as to swing on both vertical and horizontal pivots, and the opening through this arm is alsoin communication with the opening through the, member 5. The sound-box 8 is secured to the free end of the tone-arm 7, with its styilus 9 tracking in the groove in the recor 4.

The spring-motor within the box 1 is of any suitable construction, and therefore I have not considered it necessary to illustrate it. By means bf suitable gearingfilie spring of the motor is arranged to drive the shaft 2, and a governing mechanism is employed for 1( ggilating the speed at which this shaft is driven. This governing mechanism includes a shaft 10 driven by the spring-motor and having two collars 11 and 12 thereon, the former being secured to the shaft and the latter being loose thereon. These two collars are connected by leaf-springs 13, on each of which is secured a governing weight 14. To the loose collar 12, is secured a brake-disk 15, and brakes 16 are adapted to be moved into and out of contact with one face of this disk. The brakes 16 are secured to a pivotally mounted shaft 17 on the upper end of which is a cam-arm 18. A pin 19 ccacts with the arm 18, this pin being carried by a crank 20 secured upon a shaft 21 which is mounted for rotation in the frame30 of the motor and which extends upwardly through an o ening in the top of the motor-box. The rakes 16 are connected by a spring 22 to a stationary art of the frame, this spring acting upon the rakes in a direction to draw them awayfrom the diskl. thus turning shaft 17 in a direction to hold the arm 18 in engagement with the pin 19.

. Unthe upper end of the shaft 21, is a starting and speed-regulating lever 23, the

,end of which is provided with a handle 24.

, may move.

'of the motor-box and is bent adjacent to its ends to provide aspace between it and the top of the motor-box, in which the lever 23 Strip 25 is curved in an arc of a circle about the shaft 21 as a center. On the upper face of the strip are scale markings, as shown in Fig. 2, by reference to which the lever 23 may be moved to the position which will give the desired tone of reproduction, Coacting with the lever 23, is an adjustable stopping device for arresting the movement ofthe lever. Strip 25 is provided with a longitudinal slot to receive a screw 26, the head of which lies below the strip 25'and the shank of which extends upwardly through the slot and into a' threaded opening in. a stud 27. A washer 28 of rubber or other suitable material may be provided between the screw and the stud and the head 26 of the screw may have a raised portion 29 thereon entering the slot in the strip 25 toprevent the screw from turning as stud 27 is turned.

As thus constructed, it will be seen that by turning the lever 23 to the right in Fig. 2, shaft 21 is turned and carries with it the crank 20 the shape of the cam '18 is such that when the pin 19 is carried to the right in this way, the cam, shaft 1-7 and the brakes 16 may. turn, actuated by the spring 22, in a direction to carry the brakes 16 away from the disk 15. When this-is done, the motor is free to rotate. As the speedof the motorincreases, the weights 14 will move outwardly under centrifugal force and thus draw the collar,].2 and disk 15 toward the fixed collar 11, and if this movement carries the disk 15 into contact with the brakes 16, the increase in the speed of the motor will be checked. In this way, the speed of rotation of the motor depends upon the position to which the lever 23 is moved, and the strip 25 may be marked off to a scale, by reference to which any desired speed of rotation of the disk may be obtained. After this desired erases cluded and the lever 23 moved back to the position in which it is shown in Fig. 2 in order to stop the motor, the lever may be moved back to the position in which it was, without referring to scale upon the strip 25, by

merely moving it into engagement with the e.

head ofthe screw 26.

Having now described my invention, .what ,I claim as new therein .and desire to secure byluetters Patent is as follows Talking machine mechanism comprising the combination of a rotary support for a sound-record, amotor for rotating the supporta a box inclosing the motor, a governing mechanism for the motor, means coacting therewith for starting and stopping and regulating the speed of rotation of the motor, a lever pivotally mounted upon. the exterior of the box for the motor and arranged to actuate said means, a strip secured at its ends to the motor-box and overlying saidlever, said strip having a slot therein and being provided with scale-markings adjacent to the slot, and a stop device for said lever adjustable along said strip and consisting of a screw extending through said slot and a member threaded on the screw, substantially as set forth. This specification signed and witnessed this 22nd day of May, 1908.

THOMAS KRAEMER Witnesses:

EMIL SGHNELL, H. MUHLSGHLEGEL. 

